Physicochemical properties of tungsten trioxide photoanodes fabricated by wet coating of soluble, particulate and mixed precursors Ramya C.V.K.L 1 , Marketa Filipska 2 , Radim Bartoš 2 , Marcela Králová 2 , Petr Dzik 2 1 Central European Institute of Technology, Czech Republic, 2 Faculty of Chemistry, Brno University of Technology, Czech Republic Tungsten(VI) oxide coatings were formed on FTO substrates using a wet coating technique with three different liquid formulations. The first involved dispersing finely ground WO 3 nanoparticles, the second used a fully soluble WO 3 precursor (acetylated peroxotungstic acid), and the third combined both nanoparticles and the WO 3 precursor. The coatings were deposited on conductive FTO substrates using the Meyer rod wet coating method, and the resulting photoanodes showed the highest photocurrents of 0.3 mA/cm 2 when fired at 450 °C. The photoanodes were analyzed using profilometry, thermogravimetric analysis, x-ray diffraction, and cyclic voltammetry. The layers made from the combination of particulate ink/soluble precursor (the so-called brick-and- mortar building strategy) had advantageous physicochemical properties and are suitable for use as photoanodes in photoelectrochemical cells. References 1. P. Dzik, M. Veselý, M. Blašková, M. Králová, and M. Neumann-Spallart, J. Appl. Electrochem. 45, 1265 (12/2015). 2. J.-Y. Lee, J. An, and C. K. Chua, Applied Materials Today 7, 120 (2017). 3. C. H. da Costa, C. Costa, C. B. Pinheiro, I. D. da Silva Henriques, and C. A. T. Laia, ACS Appl. Mater. Interfaces 4, 1330 (2012). 4. T. Homola, Z. Ďurašová, M. Shekargoftar, P. Souček, and P. Dzik, Plasma Chem. Plasma Process. 40, 1311 (2020). 5. O. Kassem, M. Saadaoui, M. Saadaoui, M. Rieu, Sergio Sao-Joao, S. Sao-Joao, Jean Paul Viricelle, Jean-Paul Viricelle, Jean-Paul Viricelle, and J.-P. Viricelle, J. Mater. Sci. 53, 12750 (2018). 6. S. Sharma, S. S. Pande, and P. Swaminathan, RSC Adv. 7, 39411 (2017). 7. T. G. Novak, J. Kim, P. A. DeSario, and S. Jeon, Nanoscale Advances 3, 5166 (2021)
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